Void sumtwo int n1 int n2 int n3 n3 n1 n2 please

sum are printed in the calling function.
//
void sumTwo( int n1, int n2, int *n3)
{
*n3 = n1 + n2;
}
/*
Please input two integer numbers here ==> 5 10
i = 5 j = 10 sum = 5 + 10 = 15
*/
17

Lesson 08 – ARRAYS and Pointers Sample Programs
//SP8_17.cpp
// Program Description
// ___________________
//
// This program invokes the function getInput() which prompts the user for
// two integer numbers and returns the pointers to these numbers. The main()
// function then invokes function sumTwo() and passes three addresses to it,
// where the sum of the first two numbers is computed and the pointer to the
// sum is returned to the function main(), where they all get printed.
// Header files used
#include <iostream>
#include <iomanip>
using namespace std;
// User-defined function prototypes
void sumTwo( int *n1, int *n2, int *n3); // function sumTwo() is declared
void getInput( int *n1, int *n2); // function getInput() is declared
int main( void )
{
int i, j, sum;
getInput(&i, &j); // function getInput() is invoked
sumTwo(&i, &j, &sum); // function sumTwo() is invoked
cout << "\n\n\ti = " << i << "\tj = " << j << "\tsum = "
<< i << " + " << j << " = " << sum << endl;
return EXIT_SUCCESS;
}
//
// Function sumTwo() receives three parameters which are pointers to integer
// variables. The function computes the sum of the first two numbers and returns a
// pointer to their sum. The numbers and their sum are printed in the calling
// function.
//
void sumTwo( int *n1, int *n2, int *n3)
{
*n3 = *n1 + *n2;
}
18

Lesson 08 – ARRAYS and Pointers Sample Programs
//
// The function getInput() receives two addresses from the calling program,
// prompts the user to get two integer numbers, and then returns two pointers
// to these numbers to the calling function.
//
void getInput( int *n1, int *n2)
{
cout << "Please input two integer numbers here ==> " ;
cin >> *n1 >> *n2;
}
/*
Please input two integer numbers here ==> 5 10
i = 5 j = 10 sum = 5 + 10 = 15
*/
19

Lesson 08 – ARRAYS and Pointers Sample Programs
//SP8_18.cpp
// Program Description
// ___________________
//
// This program invokes the function getInput() which prompts the user for
// two integer numbers and returns the pointers to these numbers. The main()
// function then invokes function sumTwo() and passes three addresses to it,
// where the sum of the first two numbers is computed and the pointer to the
// sum is returned to the function main(). The main() function then invokes
// the function display() and passes three addresses to it. The function
// display() then uses pointers to display their values.
// Header files used
#include <iostream>
using namespace std;
// User-defined function prototypes
void sumTwo( int *n1, int *n2, int *n3); // function sumTwo() is declared
void getInput( int *n1, int *n2); // function getInput() is declared
void display ( int *n1, int *n2, int *n3); // function display() is declared
int main( void )
{
int i, j, sum;
getInput(&i, &j); // function getInput() is invoked
sumTwo(&i, &j, &sum); // function sumTwo() is invoked
display(&i, &j, &sum); // function display() is invoked
return EXIT_SUCCESS;
}
//
// Function sumTwo() receives three parameters which are pointers to integer
// variables. The function computes the sum of the first two numbers and returns a
// pointer to their sum. The numbers and their sum are printed in the calling
// function.